Stock-Based Compensation - Stock option activity (Details) - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of units outstanding at beginning	7,478,736	5,148,074	4,823,893
Number of units Granted	3,020,500	4,704,932	1,654,000
Number of units Exercised	(1,723,319)	(164,886)	(122,560)
Number of units Forfeited	(368,462)	(2,209,384)	(1,207,259)
Number of units outstanding at ending	8,407,455	7,478,736	5,148,074
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price at beginning	$ 0.68	$ 1.10	$ 1.20
Weighted Average Exercise Price Granted	6.09	0.52	0.82
Weighted Average Exercise Price Exercised	0.64	0.80	0.33
Weighted Average Exercise Price Forfeited	0.86	1.26	1.33
Weighted Average Exercise Price at End	$ 2.61	$ 0.68	$ 1.10

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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